This is a serious condition and should be treated by a vet as soon as possible. Cats that exhibit low energy levels, abnormal stool or urine colours and general weakness should be viewed as a priority situation that needs attending to.
Raw foods have long been explored by cat owners as an alternative diet to cooked, dry or other varieties that are produced especially for cats. While this can be a beneficial approach, there are risks to be aware of when feeding a raw diet.